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简介:
7.6×99
=7.6×(100-1)
=7.6×100-7.6
=760-7.6
=752.4 18.25-(3.5-1.75)
=18.25-3.5+1.75
=18.25+1.75-3.5
=20-3.5
=16.5
(+)×15-
=×15+×15-
=1+-
=1 9.6-11÷7+×4
=9.6-+
=9.6-1
=8.6
7.52÷2.5÷4
=7.52÷(2.5×4)
=7.52÷10
=0.752 29.4÷2.8×(3.5-2.3)
=29.4÷2.8×1.2
=10.5×1.2
=12.6